
#if语句
n = int(input("Enter your score:"))
if n < 60:
    print("不及格")
elif n<80:
    print("及格")
elif n<100:
    print("良好")
else:
    print("perfect")

#for语句
for i in range(2,10,2):
    print("The number is %d"%i)

#while语句
count = 5
while count>0:
    print("Now count is %d"%count)
    count -= 1
